This highly efficient filter media fits common 20" X 25" Air Cleaners after they have been upgraded using the Aprilaire 4897 Upgrade Kit. This kit upgrades air cleaner cabinets from Carrier, Honeywell, Lennox, Ultravation, General, Trion, and others.

NOTE: This filter can only be used after your air cleaner is upgraded using the 4897 rails!

This highly efficient filter media fits common 20" X 25" Air Cleaners after they have been upgraded using the Aprilaire 4897 Upgrade Kit. This kit upgrades air cleaner cabinets from Carrier, Honeywell, Lennox, Ultravation, General, Trion, and others.

NOTE: This filter can only be used after your air cleaner is upgraded using the 4897 rails!